Emissaries as ambassadors?

[Buccaneer]

If one has emissaries in all of world's capital provinces (at least), you will immediate access to any leadership changes (like a new marriage or having to re-offer an alliance). This makes them true ambassadors, I suppose. But are there any other advantages of having emissaries sitting around other faction's provinces? Do you get more messages about world events because you have emissaries out there?

[hrvojej]

Well, first, the enemy emissary would still have to be present for you to get the offer/proposal. I don't believe that you get more messages, but you can use them as agents to see everything that's going on in that province. Until the enemy assassinates them, that is, and boosts his own assassins this way.
Spies can reveal whether something's cooking in your own provinces, such as rebellion or civil war, but I don't know whether they can do anything else in enemy provinces apart from informing you that the enemy is preparing to launch a major attack on somebody/you as far as the messages are concerned.